General Category > Quadrajet Carb Talk and Tips
blow through quadrajet in a box questions....
A.G.V.chevyfreak:
[quote author=shnitzel
those pictures are excellent. and just to clarify, i plug the hole in the bottom of the carb, and i route the vacuum line out of the box and to manifold vacuum.
[/quote]
I found the pics when i was looking on blower mods and ideas. With the qjet ontop of a blower there is constant vacuum. So should work on manifold side with a blower.
pontiac had the carb before the turbo in draw thru, same issue with vacuum as blower.
Havent done turbo setups myself. Just an idea that could be an issue you are having.
On your setup its playing around with tuning to see what works best .
shnitzel:
spent some time tonight rechecking our tune with the carb box open = no boost... its pretty good. but its actually lean as NA right now. even with the secondaries open its a bit lean.
so were working at that first, get the carb running rich at WOT with it NA.
and, VERY sure with the box sealed the secondaries arnt opening. so we will work on that mod on sunday afternoon. hopefully fix that issue. glue the hole and route the line to manifold vacuum.
# on carb is "17058213"
keep you posted as we go!
shnitzel
shnitzel:
hello again, sorry for the delay. project went on stand by for a bit. but last night we played with it some and took pictures for you!
this is a VERY on the cheap budget build. everything is salvaged / scrounged from friends junkpiles....
last night we attempted to make the secondaries manual. it worked a bit better, but far from proper. so its about time we did this right.
i have bought a digital version of cliffs book and read through it a few times so far. i also have a good general book on quadrajets. however, im far from a carb guru and more into efi. but this car is going blow through carb no matter what! ha ha ha. we will win this battle!
can you guys help me through this with a little more detail. im having trouble figuring which port to send out of the box and which port to plug.
and the port that we send out of the box goes further down the intake manifold so increase the pressure differential?
and we will need to open the jets up a bunch as it is running lean even in NA mode.
so attached is pictures of the engine compartment for your amusement, and pictures of the actual carb we are using. hopefully we can make it go swoosh!
shnitzel
Cliff Ruggles:
last night we attempted to make the secondaries manual. it worked a bit better, but far from proper. so its about time we did this right.
The secondaries are already mechanical (all Quadrajets use mechanical secondaries).
Are you referring to the spring loaded secondary airflaps?......Cliff
shnitzel:
yes, we made the airflaps mechanical with a rod. were still far from working properly...
shnitzel
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